Syntax Error Converting Datetime From Character String - HELP PLEASE!

Somewhere, either in the
aspx.vb code, or the stored procedure that's being called, it doesn't
like my code since I am getting the dreaded "syntax error converting
datetime from character string" error.  I've been battling this
for two days - can someone spot what is wrong here?

The dtWdate variable is coming from a calendar control on my aspx page.
Please help - I've tried every conceivable way I can think to do this without success.
Lynnette

Here's the code:
    Private Sub GetFLSAEmpInfoRecs()
        'uses the AppSettings table to generate WHERE clause from the filter values

        Dim dtWdate As DateTime = Calendar1.SelectedDate
        Dim wValue As String = Session("svFilterValue")

        Dim cnn As New SqlConnection(constants.SQLConStrFLSA)
        Dim cmd As New SqlCommand("usp_AddFLSA", cnn)
        cmd.CommandType = CommandType.StoredProcedure
        cnn.Open()

        cmd.Parameters.Add(New
SqlParameter("@dtWDate", SqlDbType.DateTime)).Value =
Convert.ToDateTime(dtWdate)
        cmd.Parameters.Add(New
SqlParameter("@whereString", SqlDbType.VarChar, 500)).Value = wValue
      
        cmd.ExecuteNonQuery()
        cnn.Close()

    End Sub


And here is the stored procedure:

ALTER PROC usp_AddFLSA
  @dtWdate datetime,
  @whereString as varchar(255)
AS
DECLARE @strSQL as varchar(2000)

SET @strSQL =
'
INSERT INTO FLSAEmpInfo
( Emp_Number,
  PT_ID,
  Emp_Division,
  Emp_DeptInfo,
  Emp_Supervisor,
  Emp_Location,
  Emp_Union,
  Emp_SG,
  Emp_Shift,
  WrkDate
)
SELECT
  hcsoSharedTables.dbo.Employee2.Emp_Number,
  hcsoSharedTables.dbo.Employee2.[ID],
  hcsoSharedTables.dbo.Employee2.Division,
 
dbo.udf_getDeptInfo(hcsoSharedTables.dbo.employee2.Department,hcsosharedtables.dbo.employee2.Dept_Mgr,hcsosharedtables.dbo.employee2.job_dept_code),
  hcsoSharedTables.dbo.Employee2.Job_Supervisor,
  hcsoSharedTables.dbo.Employee2.Loc_Name,
  hcsoSharedTables.dbo.Employee2.[Union],
  hcsoSharedTables.dbo.Employee2.Sched_Group,
  hcsoSharedTables.dbo.Employee2.Shift,' +
  @dtWdate + ' ' + 'FROM hcsoSharedTables.dbo.Employee2' + @whereString

EXEC(@strSQL)